- OB OBrien
- The Chiffons
- Societas Musica Chamber Orchestra
- Ryan Cabrera
- The Royal Concept
- OJ da Juiceman
- Patti LaBelle & Michael McDonald
- Oran "Juice" Jones
- Timmy T
- The Edwin Hawkins Singers
- Richard Sherman & Robert Sherman
- Matoma & The Notorious B.I.G.
- The Lion King Ensemble & Lebo M
- Yello
- Richard O'Brien, Susan Sarandon & Barry Bostwick
- Michael McDonald & Patty Labelle
- Mozarteum Orchestra Salzburg & Kurt Prestel
- The Motels
- Wojahn Brothers
- Mark Ronson featuring Lily Allen
- Obie Trice & Cashis
- OG Maco
- Orchestre National de Lyon
- Outkast with Gangsta Boo & Eco
- Jim Bryant & Marni Nixon
- Orchestral Manoeuvres In the Dark
- Obie Trice featuring Akon
- Mariah Carey & Patricia Carey
- Russ Tamblyn, Marni Nixon, Natalie Wood, George Chakiris, Scooter Teague, Bert Michaels, Johnny Green & Jose de Veg
- Paul Clarkson & Siobhan McCarthy
- Matthew Koma
- Terrence Mann & Colm Wilkinson
- Siobhan McCarthy & Hilton McRae
- Usher & Michelle Chamuel
- Bobbie Gentry
- Jedi Mind Tricks & GZA the Genius
- Performed by Jennifer Hudson, Deena Jones, The Dreams & Dreamgirls (Motion Picture Soundtrack)
- Schwarze Puppen
- The Pussycat Dolls, R. Kelly & Polow Da Don
- Original Paris Swing
- Sarah Buxton
- Overdub
- One Block Radius
- Jennifer Lopez & Pitbull
- Orfeh
- The Sven Libaek Orchestra
- The Dells
- Mark Ronson, Ghostface Killah, Nate Dogg, Trife & Saigon
- Orchestra & Todd Ellison
- Tito Puente
- One Chance
- Starpoint
- Orchestre Révolutionnaire et Romantique & John Eliot Gardiner
- Moby featuring Patti LaBelle
- Orchestra of Radio Luxemburg, Louis de Froment & Aaron Rosand
- Old Crow Medicine Show, Gillian Welch & David Rawlings
- The Chorus of the Lion King 2: Simba's Pride
- Terrence Mann, Robert Billig, Colm Wilkinson & Various Artists
- White Sea
- Rob Lane
- Rosalind James
- Orange Clubbers
- Otis Redding & Carla Thomas
- The Partysquad
- Matthew James Thomas & Patina Miller
- Jayda Brown & Jasmine Watkins
- Trick Pony
- Olivia Newton-John & John Travolta
- Miles Davis Quintet
- Owl City & Yuna
- Wade Hayes
- Janja, Cheezi & Chungu
- Gillian Welch & David Rawlings
- Oppenheimer
- Orlando Brown
- Sibel Redzep
- The Gregory Brothers & Daym Drops
- Ozzie Kotani & Daniel Ho
- Odessa
- Original Broadway Cast Of Matilda The Musical
- Olive
- Olga Merediz
- TJR
- Mt. Eden
- Tribe & Gavin Creel
- Omar Chandler
- Patrick Page & Michael Arden
- Jill Scott & Eric Roberson
- Valerie June
- Orchestra Of Jesus Christ Superstar
- Sheryl Lee Ralph
- Orba Squara
- Overture
- Gina G.
- Patti Page
- Orelia Has Orchestra
- Silvio RodrÃguez
- Oobie, Trick Daddy, Fat Joe & Lil Jon & The East Side Boyz
- IceJJFish
- Todd Agnew